1990 Volume 1990 Issue Supplement37 Pages 107-113
Fifty-seven cases of vertigo were screened by means of intravenous digital subtraction (IVDSA).
Abnormal findings were noted in 49 cases. Stenosis findings were noted in 28 cases, with 18 on the right, and 8 on the left, and 2 bilaterally.
The difference between right and left steno s is could, possibly, be related to anatomical variation of vertebro-basilar artery system.